feat(user/bkots):Use subshells to speed up jobs

[BK-2020-03.git] / unitproc / bk_export_audio.sh

diff --git a/unitproc/bk_export_audio.sh b/unitproc/bk_export_audio.sh
index 1100811e3a7515016b7bc3841394a722f955a1c0..bbf3f3d86292df82974e43207ed0331553b3ac45 100755 (executable)
--- a/unitproc/bk_export_audio.sh
+++ b/unitproc/bk_export_audio.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 # Desc: Extracts audio from video files
 # Usage: bk_export_audio.sh [input_dir] ([output_dir])
-# Version: 0.1.0
+# Version: 0.1.1
 # Depends: bash 5.1.16, GNU Coreutils (8.32)
 
 # Plumbing
@@ -226,14 +226,18 @@ extract_audio_file() {
     #        arg2: desired output file extension
     #        arg3: output dir path
     # Output: audio file at path [arg3]/[arg1].[arg2]
-    local file_in file_in_ext dir_out file_in_basename;
+    local file_in file_in_ext dir_out file_in_basename path_out;
     file_in="$1";
     file_in_ext="$2";
     dir_out="$3";
+    file_in_basename="$(basename "$file_in")";
+    path_out="$dir_out"/"$file_in_basename"."$file_in_ext";
+
+    # Skip if output file already exists.
+    if [[ -f "$path_out" ]]; then return 1; fi;
 
     # Extract audio file
-    file_in_basename="$(basename "$file_in")";    
-    ffmpeg -i "$file_in" -vn -acodec copy "$dir_out"/"$file_in_basename"."$file_in_ext";
+    ffmpeg -i "$file_in" -vn -acodec copy "$path_out";
 } # Create audio file from video file
 count_jobs() {
     # Desc: Count and return total number of jobs